If you have downloaded Southwest Airline’s Ding!, be sure to keep it active on your desktop for the 20 weeks following Feb. 2, 2007. That’s when Southwest will be giving away prizes to 20 lucky winners daily to celebrate the 20th anniversary of Rapid Rewards. You could win two credits, an award, 20 credits, two awards or two awards with no seat restrictions. And on the actual anniversary, June 18, 20 Rapid Rewards members will be Dinged with either a Companion Pass valid for a full year, five awards, 10 awards or an impressive 20 awards — all with no seat restrictions. Ding is a direct link to your computer desktop, delivering discounted fares to a selection of Southwest destinations. If you are new to Ding, the 20th anniversary celebration giveaway will not apply — you will have had to download Ding before Feb. 2, 2007 for the giveaway to apply.